NDLI: Gypsum Amendment Induced Rapid Pyritization in Fe-Rich Mine Tailings from Doce River Estuary after the Fundão Dam Collapse

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Gypsum Amendment Induced Rapid Pyritization in Fe-Rich Mine Tailings from Doce River Estuary after the Fundão Dam Collapse

Content Provider	MDPI
Author	Gabriel, Nóbrega Ferreira, Amanda Queiroz, Hermano Kaneagae, Maira Otero, Xosé Bernardino, Ângelo Ferreira, Tiago
Copyright Year	2021
Description	Mine tailings containing trace metals arrived at the Doce River estuary, after the world’s largest mine tailings disaster (the Mariana disaster) dumped approximately 50 million m3 of Fe-rich tailings into the Doce River Basin. The metals in the tailings are of concern because they present a bioavailability risk in the estuary as well as chronic exposure hazards. Trace metal immobilization into sulfidic minerals, such as, pyrite, plays a key role in estuarine soils; however, this process is limited in the Doce River estuarine soil due to low sulfate inputs. Thus, to assess the use of gypsum amendment to induce pyritization in deposited tailings, a mesocosm experiment was performed for 35 days, with vinasse added as carbon source and doses of gypsum (as a sulfate source). Chemical and morphological evidence of Fe sulfide mineral precipitation was observed. For instance, the addition of 439 mg of S led to the formation of gray and black spots, an Fe2+ increase and decrease in sulfides in the solution, an increase in pyritic Fe, and a greater Pb immobilization by pyrite at the end of the experiment. The results show that induced pyritization may be a strategy for remediating metal contamination at the Doce River estuary.
Starting Page	201
e-ISSN	2075163X
DOI	10.3390/min11020201
Journal	Minerals
Issue Number	2
Volume Number	11
Language	English
Publisher	MDPI
Publisher Date	2021-02-14
Access Restriction	Open
Subject Keyword	Minerals Environmental Engineering Sulfidation Pyrite Lead Sulfide Soil Remediation Chemical Immobilization
Content Type	Text
Resource Type	Article

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